A good quality sealant will out last your normal wax products or for the car in the picture personally with the investment and time you have put into the car I would apply Ceramics, costly but will save loads of time during the re cleaning process, I use Gtechniq products on every thing.
This is only my opinion and not trying to preach, but I look after so many show cars that have different products used, the ceramics are always much easier to keep kleen and always shine well.